不同来源的威灵仙,味咸的是()
A.铁线莲
B.东北铁线莲
C.棉团铁线莲
D.威灵仙
E.以上均不是
参考答案:C
There are many people _____in a big house _____ a big yard.
A.live, with
B.living, on
C.living, with
D.lives, on
试述呼吸性酸中毒的基本特征及产生原因。